Honestly, I think it's addiction by design (intentionally, or merely A/B tested into existence, end result is similar). Emotional swings are impactful, even if repeated ones are not very individually memorable, and the endless rollercoaster is one way to keep you looking at the rollercoaster rather than at e.g. boredom elsewhere. Eventually you're habituated, and looking away looks less interesting than this fire that just erupted in you-wouldn't-guess-where / it-could-happen-to-you.